Molding apparatus



Nov. 4, 1930. A. r. BATEMAN ET AL moLDING APPARATUS AFiled Aug. 17, 1928 A3 Sheets-Sheet 1 A TTORNEYS.

Nov. 4, i930. A, T, BATEMAN ET AL MOLDING APPARATUS Filed Aug. 17,

1928 5 sheets-sheet 2 IN VEN TOR A TTORNEY BY wdrew ld/'57@ www. SLM

Patented Nov. 4, 1930 UNITED STATES PATENT OFFICE ARTHUR T.- BATEMAN AND ANDREW IRVINE, F DETROIT, MICHIGAN, ASSIGNORS TO BOHN ALUMINUM & BRASS CORPORATION, OF DETROIT, MICHIGAN, A CORPORA- 'rIoN or MICHIGAN HOLDING APPARATUS Application mea August 17, 1928. serial No. 300,285.

The invention relates to molding apparatus and refers more particularly to apparatus of the permanent type. One of the objects of the invention is to so construct a permanent mold that it may be quickly and readily operated in forming a casting of complicated shape. Another object is to so construct the mold that the casting may be ejected from the mold cavity. A further object Vis to so construct the mold that cores may be inserted into and removed from the moldv cavity and may be arranged so that they may be readily operated. With these as well as other objects in view, the inven- 15 tion' resides in the novel features of construction -and combinations and arrangements of parts as more fully hereinafter set forth.

In the drawings r- Figure 1 is a plan view of the molding apparatus, embodying our invention;

Figure 2 is an enlarged plan view of a portion thereof;

Figures 3 and4 are cross sections on the '25 lines 3-3 and 4-4 of Figure 1;

Figure 5 is a cross section on the vline 5-5 of Figure 3;

Figure 6 is a perspective view of thelcasting formed in the mold.

The molding apparatus embodying our invention has been designed for use in casting articles of complicated shape, such as valve.

lifter guides, from metal, such as aluminum or its alloys, having high crystallization shrinkage and low fusing point. The valve lifter guide, as shown in Figure 6 particularly, has the body portion 1 and the transverse tubular portions 2, which extend be yond the opposite sides of the body portion. These transverse tubular portions have at one end the arcuate extensions 3. `The body portion has extending transversely thereof the bosses 4 and the longitudinally extending langes 5 on the same side as the arcuate extensions. These anges -merge into the tubular portions. The molding apparatus has the metal base 6 and the pair of permanent mold sections 7 and-8 which are mounted upon the base. 0 Each of these mold sections is movable to- Cil wardand away from the other and longitudinally of the base and is guided by means of the key 9, which extends longitudinally centrally of the base and is xedly secured thereto. For 'moving the sections toward and away from each other, we have pro videdv the yokes 10 and 11 which have their arms xedly secured to the sides of the sections 7 and 8, respectively, and their bases ixedly secured to the plunger rods 12 adapted t0 be operated by the air cylinders 13 also mounted upon the base.-

The mold sections 7 and 8 have their' adjacent faces recessed to form the main mold cavity in which the article is cast. In detail, the mold section 8 is recessedto form that portion of the main mold cavity in which are formed the body portion 1, the bosses 4, the ianges 5 and the parts of the tubular portions 2 with the extensions 3 at the same side of the body portion. The mold section 8 is also provided with the gate 14 extending downwardly from thel top and opening into the main mold cavity. The mold section 7 is recessed to form that portion of the main mold cavity in which are extend through the main mold cavity concentrically of the portions of the recesses for forming the tubular portions 2. These cores are formed with the heads 16 beyond the mold section 8 and providing shoulders engageable by a suitable pry Vfor removing the cores from the main mold cavity. The cores are also provided with the handles 17 principally for use in inserting the cores into the mold cavity. f

For the purpose of automatically ejecting,

I extend through the bracket 20 lwhich is secured to the base 6 at one end` of the keyl 9.A Each ejector 'rod has sleeved on its reduced Y end the washer 21 which forms a' shoulder engageablefwith'the inner `face of-the' bracket upon movement of the ejectorl rod with the mold section when the latter is moved away from the other mold section. The annular shoulder 22 upon each ejector rod and formed by reducing the ejector rod anden- Y gageable with the washer 21 is so located that the washer contacts with the bracket during the movement of the mold sectionl 7 away from theniold section 8 and before this mold section 7 contacts with the bracket. As a result, the heads ofthe ejector rods operating upon the ends of the tubular portions 2 cause the casting to be ejected from the moldsection 7. For automatically positioning the ejector rods relative to the mold section 7 when the latter is in operative or casting position, this mold'secton has annular shoulders which` are engageable with the heads 19 upon movement of the .mold section toV casting or operative position.

l Each ejector rod also preferably has upon Y mi its reduced end the nut 24 which'is prefer-v ably engageable with the outer face of the bracket 20 to serve as a stop forA determining thecasting or operative position of the mold section 7. Y

For ejecting the casting formed in the main mold, cavity from the mold section 8 upon movement of this mold section from its operative or casting position, we have pro-l vided recesses in the mold section 8 forming auxiliary mold cavities at the ends" of the mam mold cavity and communicating therewith to form ears 25 extending longitudinally beyond theends of the body portion 1 of the casting. We have also provided the ejector rods 26, which extend horizontally above the base 6 and slidably engage the mold section 8, the inner ends of these 'ejector rods being engageable with the ears 25 and the outer ends,v being ixedly secured to the brackets 27 upon the base 6 by suitable means such as the nuts 28 threaded upon the ejector rods and engaging. opposite faces of the brackets. With this arrangement the axes of the ejector rods 26 are in the sameplane as the axes of the ejector rods 18 and in the median plane ofthe body portion 1 of the casting so that the casting may more readily be ejected from the mold sectionI 8. Furthermore, no part -of the casting formed `in the mam mold cavity will be damaged. After the casting has been removed, the ears 25 may be severed from the body portion.

For limiting the movement of the mold section 8 from its castingor operative position, there is a stop 29'extending transoperation and with the arts in casting oroperative position, the mo ten metal may beoured through the gate 14 into the mam m d cavity and auxiliary mold cavities and after this metal has hardened suiliciently and before the tubular portions 2 have shrunk lupon the cores 15, the latter are removed by engaging suitable pries with the heads 16 of these cores. A suitable medium Vsuch as air may then be admitted to the cylinders 13, thereby moving the mold sections 7 and 8 from their casting or operative position, during which time the ejector rods 18 and 26 eject the casting from these mold sections, sorthat it may be readily removed and the parts again placed in casting or operative position.

What we claim as our invention is:

1. In a molding apparatus, the combina tion with la base, of permanent mold sections arranged on said'base and adapted.' to form a mold cavity, said mold sections including a movable mold section, and means for ejectm the casting `formed in the mold cavity of sai A movable mold section, including an ejector rod slidably engaging said movable mold section, a head upon said rod, astnp u n said base through which the ejector` slides, means upon said rod and engageable with one side of said stop for limitmg the movement of said rod in one direction, means upon said movable mold section and engageable with said head tomove said rod in the opposite direction, and means upon said rod geable with the other side of said -stop for hmiting movement of said rodby the movable mold section. L

2. In Ya molding apparatus, the combination with a base, permanent mold sections ar' upon said base and movable toward and away from each other and cooperating to Y forma'mold cavity, ejector means secured upon said base at spaced points and adapted t0 engage the castingformedinthemold cavity for automatically ejecting the casting from the mold sections upon movement of the sections away from each other, the ejector means engageable with one side of said casting being movable relative to the base upon separa-v tion of said mold sections. A

3. In a molding apparatus, the combination with a base, permanent mold sections arranged upon` said base and movable toward and away 'from each other and cooperating to form a mold cavity, ejector means ixedly secured to said base and arranged to engage one side of the'casting, and other ejector means secured tosaid base and arranged toengage the Vop i 'te side of the castin said 'last-mentionedjlector means being a aipted for limited movement relative to said base.

4. a molding apparatus, the combinarespectively the opposite sides of.

tionwith relatively movable permanent sections having portions arranged to form the main mold cavity and auxiliary mold cavities `in theend thereof, cores associated with the intermediate portion of one of said sections and extending into the main mold cavity,

of the casting ears formed in of means for ejecting' the ,casting formed in the. mold cavity comprisingejectors assciated with said core carryindg section adjacentthe ends thereof outwar y beyond said cores and arranged to operate ugon one side t e auxiliary mold cavities, and ejectors arran ed to operate upon the opposite side of t e casting",V one set ofsaid ejectors being mounted for limited movement relative to said base.

Intestimony whereof weaiiixl our signatures.

ARTHUR T. BATEMAN. ANDREW IRVINE. 

